config(hypr): improve numeric coercion and add ensure_* warnings

- Parse numeric strings more robustly in coerce_number: convert to float then
  return int when the float has no fractional part (handles scientific notation
  and avoids brittle '.'/'e' checks).
- Add diagnostic warnings to ensure_dict and ensure_list that print the
  unexpected type and a truncated repr to stderr to help detect API shape
  mismatches.

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